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| View Original: | HEPA Filter diagram fr.svg (607x544) | |||
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| Keywords: HEPA Filter diagram fr.svg diagram showing the main parts of a HEPA filter on the large diagram; its operation is shown on the 3 smaller diagrams the thick brown/tan lines represent fibers in the filter medium the blue lines represent air flow The dark circle represents a particle dust bacteria spore etc the dotted red line represents the trajectory of the particle; consider that as soon as a particle comes within one radius of a fibre it adheres to it in the case of diffusion the particle usually 0 1 µm or smaller has such a trajectory because of the collision with gas molecules On the 100 nm to 1 micron scales that are the most challenging for filters it is helpful to think of air as a viscous fluid like molasses As the fluid flows through the filters particles are carried around the fibers of the filter medium for the most part Inertial impaction Larger particles >1 micron may be massive enough to continue to move in nearly a straight line Newton's Law as the flow is diverted around a fiber Interception Smaller particles are not much affected by inertia but if they are carried within one particle radius of the fiber they will be intercepted by it Diffusion Still smaller particles <100 nm move randomly among streamlines as they are buffeted by collisions with molecules A particle along a streamline that approaches a fiber very closely may be knocked against the fiber by such a collision PGIP HEPA_Filter_diagram_en svg through HEPA_Filter_diagram_de svg 2010-09-10 18 24 UTC HEPA_Filter_diagram_en svg LadyofHats HEPA_Filter_diagram_de svg Rotkäppchen derivative work The RedBurn <span class signature-talk >talk</span> The RedBurn Translation to French The RedBurn HEPA_Filter_diagram_en svg Original upload log This image is a derivative work of the following images File HEPA_Filter_diagram_en svg licensed with PD-user 2008-09-01T08 06 29Z LadyofHats 607x544 404084 Bytes <nowiki>corrected particle size aded average size of particles and trajectory on difuccion</nowiki> 2008-08-15T21 55 12Z LadyofHats 607x544 393067 Bytes <nowiki>darker text</nowiki> 2008-08-14T21 17 27Z LadyofHats 607x544 393021 Bytes <nowiki>this is a corrected version of the original</nowiki> 2008-08-14T21 16 33Z LadyofHats 607x544 327559 Bytes <nowiki>THID VERSION CONTAINS LABELS AS TEXT </nowiki> 2008-08-13T16 01 32Z LadyofHats 607x544 391421 Bytes <nowiki> diagram showing the main parts of a HEPA filter and the way it works Did myself using this sources http //people seas harvard edu/~jones/lab_arch/nano_facilities/hepa gif http //www sa</nowiki> Uploaded with derivativeFX High-Efficiency Particulate Arresting Philip Greenspun illustration project SVG diagrams in French | ||||
